/**
 * @module zrender/shape/Text
 * @author Kener (@Kener-林峰, kener.linfeng@gmail.com)
 * @example
 *     var Text = require('zrender/shape/Text');
 *     var shape = new Text({
 *         style: {
 *             text: 'Label',
 *             x: 100,
 *             y: 100,
 *             textFont: '14px Arial'
 *         }
 *     });
 *     zr.addShape(shape);
 */
/**
 * @typedef {Object} ITextStyle
 * @property {number} x 横坐标
 * @property {number} y 纵坐标
 * @property {string} text 文本内容
 * @property {number} [maxWidth=null] 最大宽度限制
 * @property {string} [textFont] 附加文本样式，eg:'bold 18px verdana'
 * @property {string} [textAlign] 可以是start, end, left, right, center
 * @property {string} [textBaseline] 默认根据textPosition自动设置，附加文本垂直对齐。
 *                                可以是top, bottom, middle, alphabetic, hanging, ideographic
 * @property {string} [brushType='fill']
 * @property {string} [color='#000000'] 填充颜色
 * @property {string} [strokeColor='#000000'] 描边颜色
 * @property {number} [lineWidth=1] 描边宽度
 * @property {number} [opacity=1] 绘制透明度
 * @property {number} [shadowBlur=0] 阴影模糊度，大于0有效
 * @property {string} [shadowColor='#000000'] 阴影颜色
 * @property {number} [shadowOffsetX=0] 阴影横向偏移
 * @property {number} [shadowOffsetY=0] 阴影纵向偏移
 */


var area = require('../tool/area');
var Base = require('./Base');
/**
         * @alias module:zrender/shape/Text
         * @constructor
         * @extends module:zrender/shape/Base
         * @param {Object} options
         */
var Text = function (options) {
    Base.call(this, options);    /**
             * 文字绘制样式
             * @name module:zrender/shape/Text#style
             * @type {module:zrender/shape/Text~ITextStyle}
             */
                                 /**
             * 文字高亮绘制样式
             * @name module:zrender/shape/Text#highlightStyle
             * @type {module:zrender/shape/Text~ITextStyle}
             */
};
Text.prototype = {
    type: 'text',
    brush: function (ctx, isHighlight) {
        var style = this.style;
        if (isHighlight) {
            // 根据style扩展默认高亮样式
            style = this.getHighlightStyle(style, this.highlightStyle || {});
        }
        if (typeof style.text == 'undefined' || style.text === false) {
            return;
        }
        ctx.save();
        this.doClip(ctx);
        this.setContext(ctx, style);
        // 设置transform
        this.setTransform(ctx);
        if (style.textFont) {
            ctx.font = style.textFont;
        }
        ctx.textAlign = style.textAlign || 'start';
        ctx.textBaseline = style.textBaseline || 'middle';
        var text = (style.text + '').split('\n');
        var lineHeight = area.getTextHeight('国', style.textFont);
        var rect = this.getRect(style);
        var x = style.x;
        var y;
        if (style.textBaseline == 'top') {
            y = rect.y;
        } else if (style.textBaseline == 'bottom') {
            y = rect.y + lineHeight;
        } else {
            y = rect.y + lineHeight / 2;
        }
        for (var i = 0, l = text.length; i < l; i++) {
            if (style.maxWidth) {
                switch (style.brushType) {
                case 'fill':
                    ctx.fillText(text[i], x, y, style.maxWidth);
                    break;
                case 'stroke':
                    ctx.strokeText(text[i], x, y, style.maxWidth);
                    break;
                case 'both':
                    ctx.fillText(text[i], x, y, style.maxWidth);
                    ctx.strokeText(text[i], x, y, style.maxWidth);
                    break;
                default:
                    ctx.fillText(text[i], x, y, style.maxWidth);
                }
            } else {
                switch (style.brushType) {
                case 'fill':
                    ctx.fillText(text[i], x, y);
                    break;
                case 'stroke':
                    ctx.strokeText(text[i], x, y);
                    break;
                case 'both':
                    ctx.fillText(text[i], x, y);
                    ctx.strokeText(text[i], x, y);
                    break;
                default:
                    ctx.fillText(text[i], x, y);
                }
            }
            y += lineHeight;
        }
        ctx.restore();
        return;
    },
    /**
             * 返回文字包围盒矩形
             * @param {module:zrender/shape/Text~ITextStyle} style
             * @return {module:zrender/shape/Base~IBoundingRect}
             */
    getRect: function (style) {
        if (style.__rect) {
            return style.__rect;
        }
        var width = area.getTextWidth(style.text, style.textFont);
        var height = area.getTextHeight(style.text, style.textFont);
        var textX = style.x;
        // 默认start == left
        if (style.textAlign == 'end' || style.textAlign == 'right') {
            textX -= width;
        } else if (style.textAlign == 'center') {
            textX -= width / 2;
        }
        var textY;
        if (style.textBaseline == 'top') {
            textY = style.y;
        } else if (style.textBaseline == 'bottom') {
            textY = style.y - height;
        } else {
            // middle
            textY = style.y - height / 2;
        }
        style.__rect = {
            x: textX,
            y: textY,
            width: width,
            height: height
        };
        return style.__rect;
    }
};
require('../tool/util').inherits(Text, Base);
module.exports = Text || module.exports;;